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2010.06.14 06:01 "Re: Class Y (YCbCr) tiffs with 420 subsampling", by Joris Van Damme
Thomas, > I checked into the tiff directory reader (tif_dirread.c), which again > calls TIFFScanlineSize(), which again only divides by the subsampling in > X direction, but rather ignores the subsampling in Y direction - hence > getting an invalid result. The problem is that the functionality of TIFFScanlineSize has not been definined for subsampled images, not in code nor in documentation. At some time, some parts of the library depended on some type of return in this case, others depended on another type of return, and yet other parts had their own local modified copy of the code. Attempts have been made to sort it out, but no attempt has been consistent over time. Best regards, Joris